The Story of Having a Bomb Dropped During a Study Session with My Childhood Friend After Being Rejected When I Confessed

A boy named Hoshidera Masanori confessed his feelings to his childhood friend, who he had a somewhat unusual distance with, only to be rejected. Despite this, they continued their relationship as before, but one day during a study session in his room, his childhood friend Shikamori Misaki casually dropped a bombshell. A subtle, somewhat mundane little story that seems like it could happen anywhere in modern times.